The time-transgressive termination of the African humid period

Nature Geoscience

Volumn 8, Issue 2, 2015, Pages 140-144

  Shanahan, Timothy M ^a   Mckay, Nicholas P ^b   Hughen, Konrad A ^c   Overpeck, Jonathan T ^d   Otto Bliesner, Bette ^e   Heil, Clifford W ^f   King, John ^f   Scholz, Christopher A ^g   Peck, John ^h  

^a UNIVERSITY OF TEXAS AT AUSTIN   (United States)

^b NORTHERN ARIZONA UNIVERSITY   (United States)

^c WOODS HOLE OCEANOGRAPHIC INSTITUTION   (United States)

^d UNIVERSITY OF ARIZONA   (United States)

^e NATIONAL CENTER FOR ATMOSPHERIC RESEARCH   (United States)

^f UNIVERSITY OF RHODE ISLAND   (United States)

^g SYRACUSE UNIVERSITY   (United States)

^h UNIVERSITY OF AKRON   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CLIMATE FORCING; HUMID ENVIRONMENT; INSOLATION; LAND SURFACE; RADIATIVE FORCING; SOLAR RADIATION; TRANSGRESSION;

AFRICA;

EID: 84923264300     PISSN: 17520894     EISSN: 17520908     Source Type: Journal    
DOI: 10.1038/ngeo2329     Document Type: Article

References (37)

1. Boko, M. et al. in Climate Change 2007: Impacts, Adaptation and Vulnerability (eds Parry, M. L. et al.) 433-467 (IPCC, Cambridge Univ. Press, 2007).
2. Patricola, C. M. & Cook, K. H. Sub-Saharan Northern African climate at the end of the twenty-first century: Forcing factors and climate change processes. Clim. Dynam. 37, 1165-1188 (2011).
3. Braconnot, P. et al. Results of PMIP2 coupled simulations of the Mid-Holocene and Last Glacial Maximum-Part 2: Feedbacks with emphasis on the location of the ITCZ and mid- and high latitudes heat budget. Clim. Past 3, 279-296 (2007).
4. Claussen, M. et al. Simulation of an abrupt change in Saharan vegetation in the mid-Holocene. Geophys. Res. Lett. 26, 2037-2040 (1999).
5. DeMenocal, P. et al. Abrupt onset and termination of the African Humid Period: Rapid climate responses to gradual insolation forcing. Quat. Sci. Rev. 19, 347-361 (2000).
6. Liu, Z. et al. Simulating the transient evolution and abrupt change of Northern Africa atmosphere-ocean-terrestrial ecosystem in the Holocene. Quat. Sci. Rev. 26, 1818-1837 (2007).
7. Renssen, H., Brovkin, V., Fichefet, T. & Goosse, H. Simulation of the Holocene climate evolution in Northern Africa: The termination of the African Humid Period. Quat. Int. 150, 95-102 (2006).
8. Kutzbach, J. E. & Otto-Bliesner, B. The sensitivity of the African-Asian monsoon climate to orbital parameter changes for 9000 years BP in a low-resolution general circulation model. J. Atmos. Sci. 39, 1177-1188 (1982).
9. Street-Perrott, F. A. & Perrott, R. A. Abrupt climate fluctuations in the tropics: The influence of Atlantic Ocean circulation. Nature 343, 607-612 (1990).
10. Lezine, A. M., Hely, C., Grenier, C., Braconnot, P. & Krinner, G. Sahara and Sahel vulnerability to climate changes, lessons from Holocene hydrological data. Quat. Sci. Rev. 30, 3001-3012 (2011).
11. Gasse, F. Hydrological changes in the African tropics since the Last Glacial Maximum. Quat. Sci. Rev. 19, 189-211 (2000).
12. Prentice, I. C. & Jolly, D. Mid-Holocene and glacial-maximum vegetation geography of the northern continents and Africa. J. Biogeogr. 27, 507-519 (2000).
13. Kutzbach, J. E. & Street-Perrot, F. A. Milanovitch forcing of fluctuations in the level of tropical lakes from 18 to 0 kyr BP. Nature 317, 130-134 (1985).
14. Kutzbach, J. E. & Liu, Z. Response of the African monsoon to orbital forcing and ocean feedbacks in the middle Holocene. Science 278, 440-443 (1997).
15. Levis, S., Bonan, G. B. & Bonfils, C. Soil feedback drives the mid-Holocene North African monsoon northward in fully coupled CCSM2 simulations with a dynamic vegetation model. Clim. Dynam. 23, 791-802 (2004).
16. McGee, D., Demenocal, P. B.,Winckler, G., Stuut, J. B.W. & Bradtmiller, L. I. The magnitude, timing and abruptness of changes in North African dust deposition over the last 20,000yr. Earth Planet. Sci. Lett. 371-372, 163-176 (2013).
17. Tierney, J. E. & deMenocal, P. B. Abrupt shifts in Horn of Africa hydroclimate since the Last Glacial Maximum. Science 342, 843-846 (2013).
18. Liu, Z. et al. Transient simulation of last deglaciation with a new mechanism for Bolling-Allerod warming. Science 325, 310-314 (2009).
19. Brncic, T. M.,Willis, K. J., Harris, D. J. &Washington, R. Culture or climate? The relative influences of past processes on the composition of the lowland Congo rainforest. Phil. Trans. R. Soc. B 362, 229-242 (2007).
20. Watrin, J., Lezine, A-M. & Hely, C. Plant migration and plant communities at the time of the "green Sahara". C. R. Geosci. 341, 656-670 (2009).
21. Garcin, Y. et al. Hydrogen isotope ratios of lacustrine sedimentary n-alkanes as proxies of tropical African hydrology: Insights from a calibration transect across Cameroon. Geochim. Cosmochim. Acta 79, 106-126 (2012).
22. Lutz, A., Thomas, J. M. & Panorska, A. Environmental controls on stable isotope precipitation values over Mali and Niger, West Africa. Environ. Earth Sci. 62, 1749-1759 (2011).
23. Shanahan, T. M., Overpeck, J. T., Sharp,W. E., Scholz, C. A. & Arko, J. A. Simulating the response of a closed-basin lake to recent climate changes in tropical West Africa (Lake Bosumtwi, Ghana). Hydrol. Process. 21, 1678-1691 (2007).
24. McManus, J. F., Francois, R., Gherardi, J. M., Keigwin, L. D. & Brown-Leger, S. Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes. Nature 428, 834-837 (2004).
25. Stager, J. C., Ryves, D. B., Chase, B. M. & Pausata, F. S. R. Catastrophic drought in the Afro-Asian monsoon region during Heinrich event 1. Science 331, 1299-1302 (2011).
26. Fleitmann, D. et al. Holocene forcing of the Indian monsoon recorded in a stalagmite from Southern Oman. Science 300, 1737-1739 (2003).
27. Wang, Y. et al. The Holocene Asian monsoon: Links to solar changes and North Atlantic climate. Science 308, 854-857 (2005).
28. Haug, G., Hughen, K., Sigman, D., Peterson, L. & Rohl, U. Southward migration of the intertropical convergence zone through the Holocene. Science 293, 1304-1308 (2001).
29. 13 C. Quat. Sci. Rev. 29, 2996-3005 (2010).
30. Schefuß, E., Schouten, S. & Schneider, R. Climatic controls on central African hydrology during the past 20,000 years. Nature 437, 1003-1006 (2005).
31. Nicholson, S. E. The nature of rainfall variability over Africa on time scales of decades to millenia. Glob. Planet. Change 26, 137-158 (2000).
32. Otto-Bliesner, B. L. et al. Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation. Science (in the press; 2014).
33. Vizy, E. K., Cook, K. H., Crétat, J. & Neupane, N. Projections of a Wetter Sahel in the twenty-first century from global and regional models. J. Clim. 26, 4664-4687 (2013).
34. Christensen, J. H. et al. in Climate Phenomena and their Relevance for Future Regional Climate Change (eds Stocker, T. F. et al.) 1217-1308 (IPCC, Cambridge Univ. Press, 2013).
35. Blaauw, M. & Christen, J. Flexible paleoclimate age-depth models using an autoregressive gamma process. Bayesian Analsis 6, 457-474 (2011).
36. Shanahan, T. M. et al. Late Quaternary sedimentological and climate changes at Lake Bosumtwi Ghana: New constraints from laminae analysis and radiocarbon age modeling. Palaeogeogr. Palaeoclimatol. Palaeoecol. 361-362, 49-60 (2012).
37. Laskar, J. et al. A long term numerical solution for the insolation quantities of the Earth. Astron. Astrophys. 428, 261-285 (2004).